/**
 ******************************************************************************
 *
 * @file       styleanimator.h
 * @author     The OpenPilot Team, http://www.openpilot.org Copyright (C) 2010.
 *             Parts by Nokia Corporation (qt-info@nokia.com) Copyright (C) 2009.
 * @addtogroup GCSPlugins GCS Plugins
 * @{
 * @addtogroup CorePlugin Core Plugin
 * @{
 * @brief The Core GCS plugin
 *****************************************************************************/
/*
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
 * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
 * for more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program; if not, write to the Free Software Foundation, Inc.,
 * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 */

#ifndef ANIMATION_H
#define ANIMATION_H

#include <QtCore/QPointer>
#include <QtCore/QTime>
#include <QtCore/QBasicTimer>
#include <QStyle>
#include <QPainter>
#include <QWidget>

/*
 * This is a set of helper classes to allow for widget animations in
 * the style. Its mostly taken from Vista style so it should be fully documented
 * there.
 *
 */

class Animation {
public:
    Animation() : m_running(true) {}
    virtual ~Animation() {}
    QWidget *widget() const
    {
        return m_widget;
    }
    bool running() const
    {
        return m_running;
    }
    const QTime &startTime() const
    {
        return m_startTime;
    }
    void setRunning(bool val)
    {
        m_running = val;
    }
    void setWidget(QWidget *widget)
    {
        m_widget = widget;
    }
    void setStartTime(const QTime &startTime)
    {
        m_startTime = startTime;
    }
    virtual void paint(QPainter *painter, const QStyleOption *option);

protected:
    void drawBlendedImage(QPainter *painter, QRect rect, float value);
    QTime m_startTime;
    QPointer<QWidget> m_widget;
    QImage m_primaryImage;
    QImage m_secondaryImage;
    QImage m_tempImage;
    bool m_running;
};

// Handles state transition animations
class Transition : public Animation {
public:
    Transition() : Animation() {}
    virtual ~Transition() {}
    void setDuration(int duration)
    {
        m_duration = duration;
    }
    void setStartImage(const QImage &image)
    {
        m_primaryImage = image;
    }
    void setEndImage(const QImage &image)
    {
        m_secondaryImage = image;
    }
    virtual void paint(QPainter *painter, const QStyleOption *option);
    int duration() const
    {
        return m_duration;
    }
    int m_duration; // set time in ms to complete a state transition
};

class StyleAnimator : public QObject {
    Q_OBJECT

public:
    StyleAnimator(QObject *parent = 0) : QObject(parent) {}

    void timerEvent(QTimerEvent *);
    void startAnimation(Animation *);
    void stopAnimation(const QWidget *);
    Animation *widgetAnimation(const QWidget *) const;

private:
    QBasicTimer animationTimer;
    QList <Animation *> animations;
};

#endif // ANIMATION_H
